Title :
Electromagnetic design of the RF cavity beam position monitor for the LCLS
Author :
Waldschmidt, G. ; Lill, R. ; Morrison, L.
Author_Institution :
ANL, Argonne
Abstract :
A high-resolution X-band cavity BPM has been developed for the LCLS. A dipole mode cavity and a monopole mode reference cavity have been designed in order to achieve micron-level accuracy of the beam position. The rf properties of the BPM as well as beam interaction with the cavities will be discussed including output power and tuning. In addition, methods will be presented for improving the isolation of the output ports to differentiate between horizontal / vertical beam motion and to reject extraneous modes from affecting the output signal. The predicted simulation results will be compared to data collected from low-power experimental tests.
Keywords :
accelerator RF systems; accelerator cavities; linear accelerators; particle beam diagnostics; wakefield accelerators; LCLS; RF cavity beam position monitor; Wakefield simulations; beam interaction; dipole mode cavity; electromagnetic design; high-resolution X-band cavity; horizontal beam motion; micron-level accuracy; monopole mode reference cavity; output ports; output tuning; vertical beam motion; Beams; Charge measurement; Contamination; Current measurement; Magnetic resonance; Monitoring; Pollution measurement; Radio frequency; Signal resolution; Tuning;
Conference_Titel :
Particle Accelerator Conference, 2007. PAC. IEEE
Conference_Location :
Albuquerque, NM
Print_ISBN :
978-1-4244-0916-7
DOI :
10.1109/PAC.2007.4441013
